#include<stdio.h>
#include<unistd.h>


int main()
{
  pid_t id = fork();
  if(id == 0)
  {
    while(1)
    {
      printf("我是子进程：pid:%d、ppid:%d\n",getpid(),getppid());
      sleep(2);
    }
  }
  else if(id > 0)
  {
    while(1)
    {
      printf("我是父进程：pid:%d、ppid:%d\n",getpid(),getppid());
      sleep(2);
    }
  }
  else
  {
    printf("error\n");
  }


  return 0;
}
